Every adult loves a great gag gift for christmas. Novelty stores (Spencers gifts) and ecommerce marketplaces (Amazon) are great places to find gag gifts for all ages. Of course you have your typical adult gags which go over well with young adults and seniors in your family but we find that inside jokes and dad jokes make the best impact across age groups. Kids gag gifts can go both ways as well like this funny "My First Fire" pack or the classic whoopee cushion.
When it comes to buying gifts for coworkers, a tasteful joke gift can go well with a white elephant gift exchange but it's always a good idea to keep things neutral when dealing with working relationships.